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7412: Check if Jetman is moving falling downward.
Used by the routine at 743e.
7412 call $735e Check if THRUST button pressed (Joystick or Keys)
7415 bit 1,a Set Jetman to down position if not thrusting
7417 jp nz,$74d5
741a res 7,(ix+$00) Jetman direction is DOWN or WALKing
741e bit 7,(ix+$04)
7422 jp nz,$74e0 Flip vertical direction if moving down
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